evolution of average AS Path length 


for 2 years 2000-2001
common Route View peers
some peer AS increase average length slightly
some other slightly decreased
overall close to being invariant
nov 2000: 3.60 hops
may 2001: 3.64 hops
same as noise level (1%)
no statistically significant change
reachability function invariant as a whole, 1999-2001
(exception: RIPE)